Presser mechanisms for sewing-machines



FACTURING COMPANY, A oonronn'rxon or NEWJERSEYJ'.

. PRESSERQMECHANIISMS FOR'SEWING-MACHINES, A r

Application filed December 26, 1917. Seria1 No. 208,724;

To all whom z'tmay concern Be it known that I, ALBERT H. DE Von, a

citizen of the United States, residing at.

Vestfield, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Presser -Mechanisms for Sewing-Machines, of which. the followingiis a specification, reference being had therein to the accompanying drawings.

This invention relates tosewing machines and particularly to the presser mechanisms thereof which cooperate with the' feed-d'ogs in advancing the work. I

In the presser mechanism of sewing machines as heretofore constructed the presserbar carrying the presser-foot has been vibrated up and downwith the feed-dog .dur-

ing each stitch-forming cycle of operationa Because of'the weighttof the presser-bar and -its-c0nsequent inertia a stronger spring is necessary to make. the presser-foot and bar follow the feed-dog up and down than would be necessary if the presser-foot only vibrated up and down with the feed-dog and thepresser-bar remained substantially stationary. Especially is this true in high speed machines. Various attempts have beenmade to'dimlnish the load imposed upon the feeddog by reason of the weight and inertia of the relatively heavy presser-bar but so far as is known no one of these attempts has been successful in eliminatlng the vibratlon of the presser-bar during each stitch-forming cycle of operations for all thicknesses of work and for all speeds of machines.

In this" invention it has. been sought to eliminate vibration of the presser-bar during each stitch-forming cycle of operations in order to lessen the load on the feed-dog duringits work-advancing movements thereby bettering the speed of the machine and diminishing its noise in operation. 1

In this invention the resser-afoot is yieldingly urged down upon the work'to cooperate with the feed-dog on the. opposite side thereof and the presser-bar yieldingly sup- N ported from the presser-foot, the two yielding. meansbeingso proportionedand arranged tl'iat during the normal operation of it the .machine the foot vibrates up and down.

ALBERT H. Devon, or .WESTFIELD, .NEWJERSEY, AssIGNoa'ro Inn SINGERMANU- Spe fi a i n f et s en PatentedlArig. 24, 1920.

.but the presser-b ar remains Y substantiallyi stationary. Whenthe workvaries in thick-.-; ness the V presser-bar shifts graduallym,

adapt itself to the different thickness of the work passing under the )resser-jfoot and by thetimeseveralstitches ave been made, 1- 1t arr vesat its newposition in which it re- 'mainsstationary whilethe foot alone continues to vibrateup and down in acertain desirable vibrating relation with the presserar.

Theinventionillustrated in the accom Y headbeing broken'away. ,Fi 2 shows apanying drawings in which Figure 1- shows a IIlitChlIlGiII front elevatiompart of the machine in endelevation'with t e face-plate,

of theheadremoved to expose the mechanism. Figs 3 and 4 show longitudinal and transverse vertical secti0ns respectively through the foot illustrated in Figs. '1 and 2. Figlf) showsa detailin vertical section through the presser-b'ar in the form. illus-v trated in Figs. 1 and 2. Fig. 6.sho ws a modified form of the invention in end elevation and inFig. 7 the same is shown in front elevation.

In the accompanying drawings one form V of the invention is illustrated in Figs. 1 to 5, inclusive. ()verhanging the worksupport 1 in which is inlaid the usual throat-plate 2 is an arm 3 sustaining in suitable bearings a rock-shaft 4' having at its; end within the head 5 a crank-arm 6 connected by a link (not shown) to, a needle-bar 8 slidably mounted in the head.

The under thread-handling mechanism may be of anyv suitable: form asthe invenknown stitching mechanisms.

Inthe head 5inrear of the needle-bar a presser-bar is supported. in suitable bearings, The presser-bar, Fig. 5, comprises a .tion is capable of use with almost any of the relatively thin tube or hollow cylinder 10 in ternally of which bearings 11 are formed or secured in any suitable manner. In each of thesebearings 11 apertures are formed in v line with each other to slidably receive a pin 3 131adapted for endwise movement therein independently of theLpresser-bar A block :14, Fig. 2, is externally secured to the -abutments"thus formed by the head ,33 i'offthe pin and the bent end- 31 of'the finger a presser-bar intermediate its ends within a U-shaped recess 15 in a sliding sleeve 16 loosely embracing the presser-bar; A fricmanner Well known.

From the lower end of the presser-bai' anfl arm 21 extends rearwardly, in the direction of feed. Thearm is'channeled longitudi nally or-grooved as indicated atE'QQTOJI'E-i ceive a rib 23 pivoted at 24 to the arm and fo-rmingpart of the shank or body-portion;- 25 of a presser foot to which a work 'engag 1 ing member or pad 26 is pivoted at The arm 21 isalso channeled vertically as indicated at 28, Fig.2, to receive and clear an angle or finger -29 secured by screw 30 -to. .the rib of the'sh'ank portion of the footwit h the bent upper end 31 time finger extend-f ing acrossthe arm 21.c'arriedbythe presse'r "bar.* To the arm"21*f"ast"0n the lower end of the presser -bar. a pin 32 is fixed in a sub;

stan'ti'ally upright dposition with "its adjustable-head 33spa'ce' the finger through which the shank of the pin "32 passes loosely. Between the two resilient yielding element in the form of a coiled spring 34 is interposed. This coiled spring 34 yieldingly sustains or supportsthe weight'of the presser-barand" its ad uncts'; from the presser-footand by adjusting the head 33 lthe tension-of the spring may be madea little greater than'the weight of'the l, v

vtions imparted to the presser-foot through bar and its adjuncts so as to make the p'resserbarand its adjuncts respond'quickly to a difi'erenec'in thickness of 'the'work'being opcrated upon.

For lyieldingly holding the presser-foot down upon the worka spring 35 is arranged upon the. top of the overhanging arm with one of its ends 36 resting upon the top of the .pin .13 and withits other end'37 restin onthe'top of the overl1anging-arm.

bracket 38 overhangs the spring 35 and earl-j ries an .jadjusting'screw r39yfor varyingits tensionf' The lower end of the pin 13 rests The. machine represented in the drawing work decreases in thickness the is lowered correspondingly. I

The invention comprehends broadly a is of thechaiirstitchtype and the threadcontrolling mechanism illustrated handles the'nee'dle-thread of thislt ype of machine;

It comprises differentially movable arms 41 from the bent end 3160f K v and; 42. move as those skilled in the art will readily understand. 1

being fast to the needle-bar and the other being fast to the driving link connecting the needle-bar and the crank-arm. These differentially moving arms and bar 41, ,42and 43 control the needle-thread in a manner already. disclosed in the prior art as may be ascertained fromv my. prior .Patent, "1,167,634; granted lanua1iyjl1,1fl916.

The thread-controlling mechanism also includesa .means -forevarying the take-up action as the thicknesso f the work changes.

This rock-shaft 46 within the head 5 of, the

machine is provided'with an 'arm 47"carry-* ing. a frietion-roll .48 extending between the jaws 49 and 50 fixedly secured to thepresser-bar in any suitable manner being steadied or guided. as s'hown'by the depending pin 51. 1 When the presser-bar is shifted upwardly the freeen'd'45 of the arm 44 itsri'seto its highest position-which it will be,observed.is due to the fact that-the free end; '45 of the arm is below the upper limit of the path in whiehthe take-upfarms -41 In the operation of the posing a thin piece ofmaterial to be under the ,presser foot, when the feed-dog rises from beneath the-throat-plate and engages the work against thedownward thrust of thepresser-foot; the latter. is vibrated about.

its pivotal connection 24 with the presserfoot does not change in thickness the vibrathe action of the feed-dog are not transmltted t0 the presser-barbecause the spring 34 iinterposed between the presser-fo'ot and the presser-bar acts as a shockeabsorber or cushion. This action of the spring is bepresser-bar and its fixedly connected parts, also from. the location of thebent'end 31 machine, and supbar... If the work passing under the presserlieved to result from the inertia of the of. the finger-relative to the pivotal con nection 24 and also froin its own-inertia or lag. When the workincreases in thickness -.under'surface of the presser-foot' put the spring undergreater compression and after a few stitches have been made, the

flpresser-bar gradually assumes a new posit1on substantially-the same distance above' the upper surface of the work, the presser- "foot continuing to vibrate. And when the presser-bar Presser-foot which is freetofvibrate under frame or head of a sewing machine to which" trated in another form and its differences.

from thealready described form are clearly depicted in the drawings. In the form of the invention illustrated in Figs. 6 and 7 the presser-foot comprises a work engaging portion 60 pivoted at 61 to a body portion 62 from which rises a stud 63 apertured axially to receive a pin 64 substantially like the pin 13 of the previously described form of the invention. A spring 65, similar to thespring 35 acts-upon theupper end of the pin 64 and holds the presser-foot yieldingly down upon the work in the same manner as" has been described.

The presser-bar in this form vention is like the presser-bar of the 'previously described form of the invention.

Instead, however, of sustaining the weight of the presser-bar from the presser-foot through a rearwardly extending arm fixed to the presser-bar, the weight of the same is sustained by a light coiled spring 66 inter-' I posed between the top of the pin 63 which slides within the hollow cylinder 67 of the presser-bar and a bearing 68 arranged centrally ofthe cylindrical shell 67.

Preferably the upper-end of the pin 64 is providedwith an anti-friction device in the form of a ball bearing 69 suitablysecured within the enlarged and shouldered head 70 steadying the upper end of the pin 64; The lower 'end of the pin is secured within the shank portion of the foot-by the i advancing the same, and independently actset-screw 71..

Topre'vent thepresser-foot from turning about'the axis of the presser-bar a bushing 72 is fixedly securedwithin the frame of the machine and its slotted lower end 73 embraces the parallel walls 74 of the shank operates broadly in substantially the same way as the other illustrated embodiment of the invention, the main spring 65 holding.

the presser-foot upon the work to coiiperate with the feed-dog in advancing the sameand the spring-'66 sustainlng the welght of the presser-bar from the presser-foot.

In both, forms of theinvention it is to be noted that the feed-dog is not only relieved of the'lwork of vibrating the presser-bar but also relieved of the work of' vibrating the controller-arm 44 which forms part of the ,21 with the finger 31 overlying it.

of the iii-- thread-controlling mechanism. As the controller-arm 44 is a desirable adjunct in cer tain types of machines, especially chainstitch machines, it is obviously advantageous to relieve the feed-dog of the work of In both forms of the presser-foot may be lifted to introduce or remove the work by raising the lever 18. In

vibrating such a member uselessly during each stitch-forming cycle of operations.

lnventlon the the form of the invention shown in Figs.

1-5 inclusive, the presser-foot is lifted with the presser-bar by engagement of the arm In the form of the invention illustrating Figs. 6 7 the presser-foot is lifted with the bar by reason of the engagement of the upper end of the cylindricalshell 67 with theshouldered head 70 of the pin 64 which it will'be remembered is fastened at its lower end to the presser-foot by the set-screw 71.

Having thus set forth the nature of the invention, what I claim herein is 1. In a sewing machine, a presser mecha nism lncluding a foot and a presser-bar, a

spring yieldingly urging said foot into en gagement with the work, a second spring supported by said foot and sustaining said presser-bar, in combination with work-feeding mechanism including a feed-dog movable up and down whereby during the normaloperation of the machine the presserbar is prevented from vibrating up and down with the'feed-dog during the stitching of work of a uniform thickness 'what-' ever it may be.

2. In a sewing machine, in combination,

a presser mechanism including a presserbar and a presser-foot movably connected to said presser-bar, a feeding mechanism 1ncluding a feed-dog, resilient means solely "actlng to hold the presser-foot down upon the work to cooperate with the feed-dog in ing resilient means for supporting said presser-bar from said foot whereby during the normal-operation of the machine in stitching a portion of the work of uniform thickness whatever it. may be the presserbaris sustained. stationary;

3. In a sewing machine, a presser mechaing =inechanism including a feed-dog, a spring, stationary means against wh ch one nism including a foot and a presser-bar v movably connected to said fo'ot,work-feed-- free end of the spring and said foot to yieldinglyurge the presser-foot down upon the work, and "yielding means interposed b6-1 tween the presser-foot and the presser-bar Y for yieldlngly sustaining'said'presser-ban- 4.. Ina sewing machine, in combination,

foot having a shank portion and a worka presser nieehanism' including a presser:- I.

engaging portionpi-votally connected to gether, a presser-bar, an arm fixed to said presser-bar and arranged transversely foot, and elasticmeansyieldinglyholding the 'presser-f oot down upon the work and.

iaving no action on the presser-bar in combination with work-feeding mechanism having a ris'ing-and-falling feed-dog.

5, In a sewingmachine, a presser mechanism including a presser-foot having relatively movable portions operatively connected together, apresser-bar, an arm extending rearwardly from the lower end of'said press- 1 er-bar, a pivotal connection between said arm and presser-foot located at the free end of the arm, means for yieldingly sustaining said presser-bar from saidpressen-foot, and s )ring means arranged tooperatively urge the resser-"foot downupon the work independently of the presser-bar in combination,v with work-feedlng mechanism 1ncludmg a rising-and-falling feed-dog. I v

6. In a sewing machine, apresser mechanism including apresserefoot having relatively movable portions operatively connected together, a presser-ba'r,an arm extending rearwardly from the lower endof said press er-bar, a pivotal connection between said arm vandvone portion of said presser-toot, meansfor yieldingly sustaining said presserbar from said presser-foot, a spring, a pin arranged within said presser-bareand extending in the direction of its length, said. pin having its opposite. ends in contact with a portion of the presser-foot and the spring,

in combination with work-feeding mechanismincluding'afeed-dog. 1

7. In a sewing machine having a frame and a throat-plate, a presser mechanism including a member movably connected to the frame to permit of varying the position of the member relative to-the throat-plate when j Work of different thicknessis being sewed, a

resser-foot,connections between the press-7' er-foot andmember permitting of variations of the foot relative to the member during normal :cycles of stitch-forming operations,

in combination with work-feeding, mechanism including'a feed-dog movable up and down through the throat-plateinto and out I; V V V v loot which is slnftably mounted in a fixed ,1 part of the frame of the tmachine,means of contact with the work, a spring cooperating with said feed-dog to'enable it to grip thework against the presse'r-foot, and a seca down upon the work, and means for-yield ingly supporting the ,weight of said member I from the presser-foot, in combination c with,

0nd spring supporting said member elastically from said presser-foot 01; gradually. shifting the position of said member when stationary the work pa-sjsing- ,under, the preSSr-Ifoot variesin thickness whereby the relation of the presser foot 4 and member ,may .be main.- J

tained substantially the same for different feed-dog. 5; .1

8. In apresser mechanism for sewinglmamember, connections between the foot and r the shiftable member permitting ofsvibratchines, a work-engaging-foot, a shiftable ingthe' foot while the member: isstationary, means holdingthe foot in parallel relation to the'line of seam-formation, plurality of springsacting upon said foot to thrust the footdown uponthe work and to sustain the shiftable member from the foot, said springs and connections being arranged -to relieve the. slnftable member of thevibrations to which 7 the, presser-foot is subjectedduring a succession of; stitcheforming operations \VhGII" sewing material of uniform thickness whatever the thickness may be, in combination with a feeding mechanism including a ,feeda:

dog. 7

chines, in combination, a presser-foot,v a

9, Inapresser mechanism: for, sewingma;

resser-baifreely shiftable toward or away I from said presser-foot at any time, means 7 for holding the'presser-foot down, upon the vwork acting independently of the presser- .bar, and means controlled by the thickness of the work being operated upontfor shift ing the resser-bar independently'of said {first-mentioned means presser-ba'r a substantially constant, distance to maintain the above the uppersurface .ofthe' material be ng operated upon tlnckness. I I J I 1( In a sewing machine, a presser mechanism lllClLlCllIlg in combination, a presserwhatever may, be its f foot, a memberfreely shiftablein opposite directions and relative to thdpresser-ioot throughout each oi successive stitch-forming cycles of operations, sald member being operatively connected to the Presser-foot, a

abutment, a spring; reacting against said stationary abutment andoper-I against the presser-foot and efleetive .upon

said member to sustain it substantially stations. r

11. In a sewing machine having alframe,

foot andamember connected to the presserfor yieldingly holding the presser-foot ating toholdthe resser-foot down upon the work, andra second spring reacting 115 .a presser mechanism including a presserthread controlling mechanism including a movable thread engaging member operatively connected to the first mentioned member, whereby the movable memberofthe thrcad-controlling mechanism may be prevented iron'i vibrating. during 'a succession of stitch-forming operations.

12. In a sewing machine having a frame, a work-feeding mechanism including a feeddog movable into and out of engagement with the work at the beginning and ending of afeedingoperation, a presser-foot, a member shiftably mounted in said frame and operatively connected to said foot, means governing the cooperative action of the presser-foot with the feed-dogwithout acting upon said'member, and means for gradually shifting said member toward and from the plane in which the'work travels and when the work varies in thickness, said last-named means being arranged to prevent up and down vibration of said member during normal feeding operations of the machine when the presser-foot is being vibrated by the feed-dog. V V

13. In a sewing machine having a frame, work-advancing mechanism including a feed-dog movable into and out of engagement with the work at the beginning and V ending of a feeding stroke, a presser-foot, a member shiftably mounted in said frame and operatively connected to said foot, a spring governing the cooperative action of the presser-foot with the feed-dog when the work is being advanced step-by-step, and automatic means governed by the thickness of the work for shifting said member as the work varies in thickness without subjecting the member to the vibrations to which the presser-foot is subjected during advance of work having a uniform thickness. r

14. In a sewing machinevhaving a frame, in combination, work feeding mechanism including a feed-clog, a presser foot, a member to which the presser-foot is operatively connected, means urging said presser-foot down upon the work and permitting it to vibrate with the feed-dog without vibrating said member to which it is operatively connected, said member being shiftable relative to the frame of the machine, and a thread-controlling mechanism including an arm whose position is governed by the shiftable member to vary the action of the thread-controlling means when the work varies in thickness, whereby vibrations of the presserfoot in its cooperative action with the feeddog may be prevented from reaching the arm of the thread-controlling mechanism during the normal operation of the machine upon any uniform thickness of work.

15. In a sewing machine having a frame,

in combination, work-feeding mechanism'including a feed-dog, a presser-foot, a member to which the presser-foot is operatively connected, means urging said presser-foot down upon'the work permitting it. to V1- brate :withthe .feed-dog without vibrating the feed-dog may be prevented from efi'ecting the element during the normal operation of the machine upon any uniform thick-' ness of the work.

16. In a sewing machine having a worksupport and stitch-forming mechanism including a needle, in combination, feeding mechanism including a feed-dog and presser mechanism including a presser-foot cooperating with said feed-dog, means confining said presser-foot to translatory movement in a direction perpendicular to the plane of the work-support, a spring for'urging said presser-foot down upon the work, a relatively fixed abutment against which said spring reacts, and a pin interposed between the presser-foot and the spring and acting independently of said confining means for transmitting the force of the latter to the former.

17. In a sewing machine having an overhanging arm, in combination, feeding mech- V anism including a feed-dog, presser mechanism including a presser-foot cooperating with said feed-dog, means confining said presser-foot to translatory movement in a direction perpendicular to the plane in which the work moves, a spring sustained by the overhanging arm for urging the presserfoot toward the feed-dog, a pin interposed between the presser-foot and the spring for transmitting theforce of the latter to the former, a sleeve embracing said pin, a bushing on said sleeve bracing said pin intermediate its ends, a relatively light spring supporting said sleeve from the presserfoot, and a thread controlling mechanism including a thread engaging arm connected to said sleeve, said arm and sleeve being floated on said relatively light spring whereby they are shifted by variation in the thickness of work passing under the presser-foot without being subjected to the vibrations which the feed-dog communicates to the presserfoot during each of successive stitch-form-.

ing cycles of operation.

18. In a sewing machine, in combination, a presser mechanism including a presserbarand a presser-foot movably connected to said pressersbar, feeding mechanism, yielding means actin independently of the presser-bar to hold tlie presser-foot against the Work to cooperate with the feeding mechanism, and independently acting yield- 'ingmeans for connecting the presser-bar andfoot whereby during normal operation of the machinein stitching the presser-bar '5 may remain stationary. p

19. In a sewing machine in combination, resser mechanism including .a presserbar and a1p1'esser-f00t, yielding means for I holding the presser-foot against the Work and acting independently of the presser-ba-r, l0 and yielding means connecting the presserbar and presser-foot. A

In testimony whereof I have signedmy name to this specification.

ALBERT H. DE Von.- 

